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May 3-5, 2013
5.1 Visa information
Citizens of most European countries do not need a visa to stay in Ukraine for less than 90 days (details). If in doubt, please contact the Ukrainian embassy in your country.
Also note that a visa is typically required for work-related visits. Since you may have a hard time explaining to officials that you've come to write software for free, you'd rather not mention this fact.
5.2 Getting there
Odessa International Airport (ODS) has daily direct connections from and to Kyiv, Vienna, Istanbul, Warsaw, Budapest, Prague and Moscow.
For any questions or emergencies, you can always call Roman Cheplyaka at +380-66-228-57-80.